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|Noun||1.||cell organ - a specialized part of a cell; analogous to an organ; "the first organelle to be identified was the nucleus"|
cell - (biology) the basic structural and functional unit of all organisms; they may exist as independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals
cilium - a hairlike projection from the surface of a cell; provides locomotion in free-swimming unicellular organisms
organ - a fully differentiated structural and functional unit in an animal that is specialized for some particular function
lysosome - an organelle found in the cytoplasm of most cells (especially in leukocytes and liver and kidney cells)
cell nucleus, karyon, nucleus - a part of the cell containing DNA and RNA and responsible for growth and reproduction
nucleole, nucleolus - a small round body of protein in a cell nucleus; such organelles contain RNA and are involved in protein synthesis
centriole - one of a pair of small cylindrical cell organelles near the nucleus in animal cells; composed of nine triplet microtubules and form the asters during mitosis
ribosome - an organelle in the cytoplasm of a living cell; they attach to mRNA and move down it one codon at a time and then stop until tRNA brings the required amino acid; when it reaches a stop codon it falls apart and releases the completed protein molecule for use by the cell; "the ribosome is the site of protein synthesis"
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